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iOS 11.3/ iOS 11.4 battery draining fast issue [Fixed]

Many iPhone users have complains of severe battery drain in iOS
11.4. The latest iOS is reported with poor battery life after users upgraded to
latest iOS11.4. The battery life is very poor in ios11.4 as the battery drain
really fast. The battery drain is very surprising in many cases as it happens
to be like 10% in 15 minutes only.

Almost all iPhones including iPhone X, iPhone 8 and iPhone 7/6
have been reported to get affected with poor battery with upgrade to iOS 11.4. It's possible that the 11.4 broke some application and that application is using the location services more than it needs to. You could try to disable access to location services app by app and see which one is the one using it constantly. Sometimes
the battery drain is immense and consumption is too high by system applications.

How to fix poor battery life in iOS 11.3/iOS 11.4:

Go to Settings -> Battery usage and check which apps are
consuming tom much memory. See if you can do anything about this. In most of
the cases application like Facebook, snapchat consumes too much battery and
data after upgrade of iOS. You can try re-installing these apps to latest
versions to fix any memory leaks. Or you may try following fix’s :

Fix 1.Turn off
iCloud Drive sync: Change the iCloud setting to turn off the sync as this is major
battery consuming take (like photos, video upload). Please check that any major
cellular updates are also turned off.

Fix 2. Turn off
Siri & Search indexing in Photos- to
minimize the "risk" of lots of background activity that might drain
the battery. It is quite possible that iOS 11.4 will be reading in the
background the photos to try indexing and clustering them in order to offer
better search options

Fix 3. Try
setting Auto-Lockto a new value:iOS system
update might have set Auto-Lock to Never so the screen never turned off.

Fix 4. ResetGeneral
settings: Clear the safari history. Turn the iMessage off for about 10
seconds then back on. Now Goto-> cellular settings and toggled ALL settings
either off then on or on then off again depending on how they were originally
set. Now hard reboot the iPhone and check the battery performance.

Fix 5. Turn Off unnecessary
widgets/application: it is always recommended to disable any unnecessary widgets
lying on your lock screen. You can also consider disabling Raise to wake
feature and optimizing screen ON time etc.